code: def read(self):
      # return the frame most recently read
      return self.frame
  
file_path: imutils/imutils/video/pivideostream.py
imports: from picamera.array import PiRGBArray
  from picamera import PiCamera
  from threading import Thread
  import cv2
label_desc: Use image node_id 4 for calling the PiVideoStream obj's underlying member method code with example usage: obj.read() and returns: self